JP2956211B2 - Display method of fluorescent display tube - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display method for displaying an operating state of a device, a change in signal level, and the like using a fluorescent display tube.

2. Description of the Related Art Sound equipment and video equipment generally use indicators such as LEDs, liquid crystal displays, and fluorescent display tubes to display the operating state of the equipment and signal level changes to improve visibility and operability. , And design features.

In recent years, fluorescent display tubes are widely used in audio equipment and video equipment, and the position of an input selector, the operation state of each function, and a change in signal level are displayed in several frequency bands (hereinafter referred to as spectrum display). Or call it).

By the way, in the conventional display method using the fluorescent display tube, each segment of the fluorescent display tube is simply lit at the same brightness, and even if the display content is changed by operating various operation buttons, the corresponding segment is not displayed. Simply turning on and off simply lacked a visual and interesting expression of the state change during the change. Also, it is difficult to display two or more display contents such that the same or nearby segments are lit at the same time.

Problems to be Solved by the Invention As described above, when displaying the operating state of audio equipment or video equipment or a change in signal level using the fluorescent display tube, the display is performed by operating various operation buttons in the conventional display method. Even if the content changes, the corresponding segment simply lights up,
Just by changing the light off, it lacks the visual interesting expression of the state change in the middle of the change, and it is also possible to display two or more display contents that overlap the same or nearby segments at the same time. It is difficult.

An object of the present invention is to provide a display method using a fluorescent display tube of an audio device, a video device, or the like that solves the above-mentioned drawbacks.

Means for Solving the Problems In order to solve the above-mentioned problems, a display method of a fluorescent display tube according to the present invention includes a fluorescent display tube in which a light emitting portion is configured in a matrix by m grids and n segments. A display device comprising: an input terminal having a plurality of input terminals; and an output terminal for dynamically lighting the fluorescent display tube, wherein m grid applied voltage signals are the same scan signal having a constant scan time width, and are turned on. The segment applied voltage signal to be turned on is a scan signal that can be selected from a plurality of scan time widths in accordance with a signal input to the input terminal, so that the luminance of the segment is changed in several steps to light up. Is a display method.

According to the display method using the fluorescent display tube of the present invention, the grid applied voltage signal of the fluorescent display tube is a scan signal having a fixed scan time width, and the corresponding segment applied voltage signal to be turned on can be selected from a plurality of scan time widths. By changing the display width by changing the brightness of the segment in several steps by turning it into a scan signal by changing the time width and operating the various operation buttons, it is as if an afterimage remains. Simultaneously superimpose two or more different display contents, such as displaying the interesting taste of continuous changes visually and displaying the frequency characteristics of the device using the same segment at the same time while darkening the spectrum display An object of the present invention is to provide a display method of a fluorescent display tube, which can also perform display.

Embodiment FIG. 1 is a circuit block diagram showing an embodiment of the display device of the present invention, in which a fluorescent display tube 1 as shown in FIG. Here, the light emitting portion of the fluorescent display tube 1 is G1 to Gm
Are arranged in a matrix by m grids and n segments S1 to Sn.

The one-chip microcomputer 2 has G1 to Gm as output terminals,
It has S1 to Sn and has input terminals IN1 to INx of an AD input unit and general input ports INX + 1 to INx + y. Reference numeral 3 denotes a signal processing unit, which is composed of x bandpass filters that divide an input signal into predetermined frequency bands.
In the present embodiment, the signal is divided into frequency bands f1, f2 to fx and input to the AD input terminals IN1 to INx of the one-chip microcomputer 2. An input operation unit 4 includes operation buttons SW1 to SWy. Reference numeral 5 denotes a graphic equalizer unit, and its frequency characteristics can be changed by operating a control button of the input operation unit 4 by a control signal from a control terminal CONT of the one-chip microcomputer 2. The output terminals G1 to Gm and S1 to Sn are used for the one-chip microcomputer 2, and the corresponding segment of the segments S1-1 to Sn-x on the grid G1 to Gx of the display portion of the fluorescent display tube is turned on and the graphic is displayed. A program for performing a spectrum display process according to the frequency characteristics of the equalizer unit 5 and the input levels of the AD inputs IN1 to INx is incorporated.

FIG. 3 shows the output terminals G1 to Gm, S1 of the one-chip microcomputer 2.
1 to 5 show scan output voltages of Sn. The fluorescent display tube is dynamically lit, and the cycle T of the scan output voltage is repeated at a short cycle of about 10 ms at which no flicker is visible.

The operation of the embodiment in the display device using the fluorescent display tube configured as described above will be described below.

Now, when the frequency characteristics of the graphic equalizer unit 5 are in the state shown in FIG. 4 (a) on the fluorescent display tube, the buttons of the operation unit 4 are operated to sequentially change the state to FIGS. 4 (b) and (c). It is assumed that the frequency characteristic in the state shown is continuously changed. At this time, the segment S2-3 whose lighting state has changed,
By reducing the width of the scan output voltage on the segment S2, S3 side in order to change the lighting luminance of S3-3, S4-3, it is possible to visually make it look like an afterimage remains.

For example, if the luminance is changed in three stages, the grid scan output voltage during the change from FIG. 4 (a) to FIG. 4 (b) and further to FIG.
The width of the scan output voltage is reduced as shown in FIGS. 5 (a), 5 (b), 5 (c), 5 (d), and 5 (e), respectively, to reduce the segment scan output voltage. By displaying the state change with a time constant ta of about several hundred ms, it looks visually like an afterimage remains.

Also, as shown in FIG. 6, in order to simultaneously display the spectrum and display the frequency characteristics of the graphic equalizer section 5 in a superimposed manner, the spectrum display is performed in a state where the width of the scan output voltage is narrowed and the luminance is reduced. The characteristic display does not decrease the brightness of the segment that overlaps the segment displaying the spectrum display.It lights up at normal brightness, so that two different display contents such as brightening the frequency characteristic display against the dark background of the spectrum display are displayed at the same time. It can be displayed.

Effects of the Invention As described above, according to the present invention, even if the grid applied voltage signal is a scan signal at a fixed interval, only the scan time width of the segment applied voltage signal is selected from a plurality of scan time widths and can be changed to thereby change the fluorescent display tube. It can be turned on at a linear brightness interval from low brightness to high brightness, when the display content changes, the corresponding segment visually looks like an afterimage remains, and it can express the interesting taste of continuous change Alternatively, a display method of a fluorescent display tube can be realized in which two or more different display contents are simultaneously superimposed and displayed.

[Brief description of the drawings]

FIG. 1 is a circuit block diagram showing one embodiment of the display device of the present invention, FIG. 2 is an explanatory view of a main part of a fluorescent display tube, FIG.
FIG. 5 shows the output terminals G1 to Gm, S1 to
FIG. 4 and FIG. 6 are diagrams showing display examples of the display portion of the fluorescent display tube. Reference numeral 1 denotes a main body of a fluorescent display tube, 2 denotes a one-chip microcomputer, 3 denotes a signal processing unit constituted by a band-pass filter, 4 ... an input operation unit constituted by operation buttons SW1 to SWy, 5 ... Graphic equalizer section, t1 ... "H" level time during segment lighting, t2, t3 ... "H" level time during segment lighting with reduced brightness,
t: Time of the "H" level of the grid.

Claims (1)

(57) [Claims] A means having a fluorescent display tube in which a light emitting portion is formed in a matrix by m grids and n segments, a number of input terminals and an output terminal for dynamically lighting the fluorescent display tube. Wherein m grid applied voltage signals are the same scan signal having a constant scan time width, and the corresponding segment applied voltage signal to be turned on is a plurality of scans according to a signal input to the input terminal. A display method for a fluorescent display tube, characterized in that the segment is turned on by changing the luminance of the segment in several steps by using a scan signal selectable from a time width.